add video commands

Kubernetes/Docker-Kubernetes-Data-Migration/readme.md

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+# Instructions
+1. Create Longhorn volume
+1. Mount longhorn volume to a node (recommend worker node)
+1. Log into selected worker node
+1. Create temporary folder for migration
+sudo mkdir /tmp/folder
+1. List the disks to format
+sudo fdisk -l
+1. Format the disk 
+sudo mkfs -t ext4 /dev/sdx
+1. Mount the new disk to tmp folder
+sudo mount /dev/sdx /tmp/folder
+1. Copy data from Docker Host to new drive (substitute your values below)
+sudo rsync -avxHAX username@DockerHostIP:/home/ubuntu/docker/some-directory/* /tmp/folder